Backup Harps or Positions - Playing with Others Series

It sounds simple, but if you rely on a few harp keys a lot  (most players use three harp keys the most) it's a good idea to have backup harps of those. If not, you'll want to be comfortable with playing in multiple positions, so if a harp goes out you can still cover that key in a performance with other harps in other positions. For example... your coveted A Harp in 2nd Position puts you in the Key of E and it goes out. What options do you have?

1) Stay away from the hole(s) that's bad
2) Use a D Harp in 3rd Position or an E Harp in 1st Position.